topic Re: About JPEG decode by gst command. in i.MX Processors

About JPEG decode by gst command.

keitanagashima — Wed, 27 Jul 2016 04:34:00 GMT

Dear All,

Device: i.MX 6Q

BSP: L3.14.28_1.0.0

My customer wants to use the below gst command to display the jpeg file.

<Command A>

$ gst-launch-1.0 filesrc location=<jpeg file> ! decodebin ! imxg2dvideosink

But, the "imxvpudec" element has been automatically chosen and the element supports only Baseline profile .

BTW, the below command can display the jpeg file except Baseline profile.

<Command B>

gst-launch-1.0 filesrc location=<jpeg file> ! jpegdec ! imxg2dvideosink

[Question]

Do you know the modification method that "jpegdec" is automatically chosen by the <Command A>?

Best Regards,

Keita

Re: About JPEG decode by gst command.

Yuri — Wed, 27 Jul 2016 06:37:31 GMT

Hello,

Looks like, You need using the API rather than gst-launch.

Have a great day,
Yuri

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Re: About JPEG decode by gst command.

keitanagashima — Wed, 27 Jul 2016 07:15:23 GMT

Hi Yuri,

Thank you for your reply.

> Looks like, You need using the API rather than gst-launch.

Is your mentioned API described in i.MX VPU Application Programming Interface Linux Reference Manual?

The VPU looks only supporting the Baseline profile from Release note & below community.

Issues decoding MJPEG with VPUdec

My customer wants to decode the JPEG with Baseline and other profiles.

So, I think that source code of "decodebin" should change.

Best Regards,

Keita

Re: About JPEG decode by gst command.

Yuri — Wed, 27 Jul 2016 09:06:47 GMT

Hello,

I mean Gst API (C++).

Regards,

Yuri.

Re: About JPEG decode by gst command.

keitanagashima — Wed, 27 Jul 2016 09:22:28 GMT

Hi Yuri,

Hello. Sorry I couldn't understand the "Gst API (C++)".

What is it?

Best Regards,

Keita

Re: About JPEG decode by gst command.

Yuri — Wed, 27 Jul 2016 09:38:38 GMT

Hi,

Basic tutorial 1: Hello world! - GStreamer SDK documentation - GStreamer SDK documentation

Tutorials - GStreamer SDK documentation - GStreamer SDK documentation

https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/manual.pdf

~Yuri.

Re: About JPEG decode by gst command.

keitanagashima — Fri, 29 Jul 2016 02:23:29 GMT

Hi Yuri,

Thank you for your reply.

OK. I got it.

Best Regards,

Keita